<template>
  <el-container class="home_container">
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../../assets/logo.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button>
    </el-header>
    <!-- 页面 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单 -->
        <!-- 
          unique-opened	      是否只保持一个子菜单的展开
          collapse            控制折叠 
          collapse-transition 折叠动画
          default-active	    当前激活菜单的 index--刷新保留激活高亮状态
        -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <template slot="title">
              <!-- 一级icon -->
              <i :class="iconObj[item.id]"></i>
              <!-- 一级文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/'+item.path"
              v-for="item in item.children"
              :key="item.id"
              @click="saveNavState('/'+item.path)"
            >
              <!-- 二级icon -->
              <i class="el-icon-menu"></i>
              <!-- 二级文本  -->
              <span>{{item.authName}}</span>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      menuList: [],
      iconObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      isCollapse: false,
      // 被激活的点击
      activePath: ''
    }
  },
  methods: {
    loginOut() {
      window.sessionStorage.clear('token')
      this.$router.push('/login')
    },
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.data.meta.msg)
      this.menuList = res.data
      // console.log('this.menuList', res.data)
    },
    // 点击按钮折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>

<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    height: 100%;
    display: flex;
    align-items: center;
    img {
      border: 5px solid #fff;
      border-radius: 50%;
      height: 80%;
    }
    > span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .toggle-button {
    background-color: #4a5064;
    color: #fff;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    letter-spacing: 0.2em;
    // 移入显示小手
    cursor: pointer;
  }
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
</style>